Working pawl for ammunition-hoists.



No. 668,083. Patented Feb. l2, mm. L

J. BOGEL.

WORKING PAWL FOR AMMUNITION HOISTS.

(Application med Feb. 28, 1900.)

2 Sheets-*Sheet (No-Modal) Patented Feb. I2; I901.

J BOGEL WORKING PAWL FOR AMMUNITION HOISTS.

(Application filed Feb. 28, I900.)

2 Sheets-Sheet 2 (No Model.)

'INVENTOR. 4

' ATTOR.NEY. I

WITNESSES.

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JOSEF BOGEL, ornssun, GERMANY, ASSIGNOR' To ru ns. KRUPP, or SAME PLACER r W ORKING'PAWL FGR AMMUNIT'ION-HOISTS.

SPECIFICATION formingpart of Letters Patent N 0. 668,083. dated February 12, 1901.

Application filed February 28, 1900. Serial No. 6,796. (No model.) i

- To all whom it may concern: Be it known that I, JOSEF BOGEL, engineer, a citizen'of the German Empire, residin g at ll Gottfriedstrasse,Essen-on-the-Ruhr,

Germany, have invented certain new and useful Improvements in Working Pawls or.

sition by their own weight or by springs, so

that it may happen that through some external cause they may recede from the working position, wherefrom not only irregularities in the'operation may result, but serious accidents may becaused, for instance, inhoisting apparatus. I

The object of-my present invention is to 2 5 prevent accidents and to insure more perfect security of the operation by retaining the pawl in its working position through the working pressure against it.

-My invention will be best understood by reference to the annexed drawings, in which- Figure 1 shows a pawl and casing in front elevation; Fig. 2, a side View of Fig. 1, partly in section, the side plate E, Fig. 1, removed; Fig.3, a section on the line 3 3, Fig. 2. Figs.

4 and 5 are sectional side views illustrating modifications.

Similar letters refer to correspondingp'arts' in the several views.

. In Figs. -1 to 3 of the drawings the pawl is shown formed of two partsnamely, a body K and a headpiece D--which are held together by a side plate E. B is the push-rod, formed with a casing with a separate bottom Oscrewed to it. 'Within this casing the part K of the pawl is pivoted to lugs projecting from the bottom C by a bolt L,.so as to be free to turn thereon toa limited degree. The pawl-body K has a' cylindrical part a, which fits a correspendin cylindrical cavity of the headpiece D, and the two parts are held together by the cheohplate E, screwed against In such apparatus as hitherto used the one side of the body K, the other side having a similar cheek-piece m, made in one piece therewith. The headpiece has an extension it, against which bears a spring ll, abutting against a bush I), screwed into the bottom 0, and is also provided with an eX- tension f, having two lugs f and f engaging corresponding recesses g and g in the casing.

When no pressure is exerted againststhe upper face d of the headpiece D, the same under theaction of the spring I-I takes the position shown in full lines in Fig. 2, the lugs f f being disengaged from the recesses 1'9 and the whole pawl being under the action of the spring H, so that the pawl when not in action is free during the motion of the lifting-rod or push-rod to oscillate into andont of the casing, as in apparatus hitherto used. When, however, there is a working pressure against the upper face cl ofthe headpiece D, the same is pressed into the position shown indotted lin'es in Fig. 2, the lugs f engaging the notches 'Q" g whereby the latch is locked against turning on its pivot. As soon as the w'ork'i pressure is removed the spring H, which wascompressed by the turning of the headpiece; returns the latter to its original position, so that the latch is liberated.

It isreadily seen that the above-described arrangement permits the use of a .much weaker pawhspring than-tin the apparatus hitherto used, thereby materially reducing the wear and. tear of the moving parts and '85 increasing the efliciency.-

Without. departing from the spirit of my invention the pawl, instead of being formed of two parts, of. which the. one part turns upon the other, may be formed of two parts, of which the one slides upon the other, as illustrated in Fig.4. In this figure the headpiece D is arranged to slide toward and from the body K of the'pawl and is provided with a lug or projection f, adapted to engage with a recess g, formed in the lifting or push bar B, for the purpose of locking the pawl when the load is on it and releasing it when the load is removed. The headpiece D, as before, is acted upon by aspning H, connected thereto too in this example by abellcrank lever. It is furthermore to he understood that it is not absolutely necessary to make the pawl in two parts, one of which is i'novable'with respect to the other, since it may be made in one piece and-its pivot mounted to have a limited slid- 5 ing motion against a spring. This construction I have illustrated in Fig. 5, where the pawl K is hinged to a sliding casing C, which Tfs connected with. the push-rod B by a pin m, g which enters a socket y in the push-rod, and to by a bolt p, passing through a forked or bifurcated part of the casing and entering the push-rod. I The pawl is subjected to the actionof a spring H to throw it outwardly and upwardly, but moves downwardly against the K5 action of said spring when engaging the load,

Y so as tobringthe projecting lug f into en-, gagement with the recess 9 of the push-bar. When, the load is removed, the spring H moves the pawl upwardly. 2 o It will be readily-seen from the foregoing description that in each of the forms shown the pawl is so mounted or constructed as to. I yield under the load and that the movement produced by such yielding causes the engage- :5 mentof the interlocking devices and locks the pawl firmly in its working position, thus rendering the lift or hoist absolutely safe,

"Whether this necessary locking movement is effected by permitting the pawl as a whole to 0 yield or by permitting a part of the pawl to yield is immaterial, the essential feature of my invention being an oscillating pawl adapted to yield under pressure for efiecting the locking of the pawl. 5 What I claim as new is' r 1. In an apparatus of the character specitied, a push-bar provided with a recessed cas- 7 ing, a spring-pressed pawl pivoted within the casing and projecting beyond the same, inter- 0, locking devices formed on the pnshbar and secesson the pawl and said pawl being mounted to yield under the load against the pressure of the springfor effecting engagement of the interlocking devices and so securing the pawl in its Working position, and said spring disengaging the pawl when the load is removed, substantially as described.

2. In an apparatus of the character specified, a casing formed on the push-bar and provided with recesses,'a pawl consisting of a rear part pivoted to the casing and a front part with the impact-face pivoted to the rear part so as to allow a limited oscillation .thereon, alug or lugs-on said front part, a spring abutting against'the bottom of the casing and against the-front part, the lugs on the front part engaging the recesses in the casing, when the impact-faceactsagainst a resistance, whereby the pawl is locked, while the spring unlocks the pawl when there is no pressure against theface', substantially as and for the purpose specified, p

3. In an apparatus of the character specitied, a push-bar, aspring-pressed pawl in connection with the push-bar, interlocking devices formed on the push-bar and on the pawl andsaid pawl being mounted to yield under 

